Instructables

How to Build a Megaphone Bike Stereo

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Step 5: Mount Hardware

The first version of this project used 4 D sized alkaline cells - these lasted a long long time.... Ultimately, I ended up using a small 6V sealed lead acid battery for rechargeable goodness.

The second picture shows the plastic spacers used to interface with the boom box speaker's mount. Also notice the zip tie holding the blue cat5 cable to the circuit board to serve as strain relief in the event the cord should ever get tugged on. This turns out to be absolutely necessary.

The circuit board is mounted to the speaker on one of the machine screws.
 
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geebear773 years ago
If you put a baffle behind that speaker, you can double the volume and get a richer tone. I bought ready made from a car audio store, but you can just use tupperware.
trebuchet03 (author)  geebear773 years ago
In an open air environment, I'm not too worried about the richness of tone :) Plus, then only one ear is going to get sound ;) With the back end open, you get some form of audio coming out the rear.

Check out my profile, one of the smaller images is a later bike stereo build using 2 speakers on either side inside of an enclosure.